C# 使用RotateTransform从中心旋转绘图刷

我有一个用户控制的罗盘，我希望旋转。我试着从中心旋转它，谷歌找到了大量使用

renderTransferMorigin=“0.5,0.5”

来实现这一点的参考资料。但出于某种原因，这是行不通的。它只是以角为原点旋转UserControl

如果我在UserControl内设置了

CenterX=“150”

和

CenterY=“150”

，它就会工作。但是我还要将主窗口中UserControl的高度和宽度设置为300

调用UserControl时，如何使UserControl从其中心点旋转，而不考虑设置的高度和宽度设置？我还希望在UserControl内部设置RenderTransferMorigin，而不是在调用它时

（简化）用户控制XAML：

<UserControl x:Class="Poseidon.Views.CompassUserControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Poseidon.Views"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">

    <Grid>
        <Grid.Resources>
            <DrawingBrush x:Key="Compass_ver1">
                <DrawingBrush.Drawing>
                    <DrawingGroup>
                        <DrawingGroup.Children>
                            <GeometryDrawing Brush="#FF000000" Geometry="M 375.286,151.366C 486.487,151.366 576.634,241.513 576.634,352.714C 576.634,463.915 486.487,554.061 375.286,554.061C 264.085,554.061 173.939,463.915 173.939,352.714C 173.939,241.513 264.085,151.366 375.286,151.366 Z "/>
                            <GeometryDrawing Geometry="M 375.286,151.366C 486.487,151.366 576.634,241.513 576.634,352.714C 576.634,463.915 486.487,554.061 375.286,554.061C 264.085,554.061 173.939,463.915 173.939,352.714C 173.939,241.513 264.085,151.366 375.286,151.366 Z ">
                                <GeometryDrawing.Pen>
                                    <Pen Thickness="0.755907" LineJoin="Round" Brush="#FF000000"/>
                                </GeometryDrawing.Pen>
                            </GeometryDrawing>
                            <GeometryDrawing Brush="#FFFFFFFF" Geometry="M 382.484,188.872C 472.971,192.847 543.103,269.425 539.128,359.912C 535.153,450.399 458.575,520.531 368.088,516.556C 277.601,512.58 207.469,436.003 211.444,345.516C 215.42,255.029 291.997,184.897 382.484,188.872 Z "/>
                            <GeometryDrawing Geometry="M 382.484,188.872C 472.971,192.847 543.103,269.425 539.128,359.912C 535.153,450.399 458.575,520.531 368.088,516.556C 277.601,512.58 207.469,436.003 211.444,345.516C 215.42,255.029 291.997,184.897 382.484,188.872 Z ">
                                <GeometryDrawing.Pen>
                                    <Pen Thickness="0.755907" LineJoin="Round" Brush="#FF000000"/>
                                </GeometryDrawing.Pen>
                            </GeometryDrawing>
                            <GeometryDrawing Brush="#FF000000" Geometry="M 375.286,227.352L 389.511,202.805L 403.736,178.258L 375.286,178.258L 346.836,178.258L 361.061,202.805L 375.286,227.352 Z "/>
                            <GeometryDrawing Geometry="M 375.286,227.352L 389.511,202.805L 403.736,178.258L 375.286,178.258L 346.836,178.258L 361.061,202.805L 375.286,227.352 Z ">
                                <GeometryDrawing.Pen>
                                    <Pen Thickness="0.755907" LineJoin="Round" Brush="#FF000000"/>
                                </GeometryDrawing.Pen>
                            </GeometryDrawing>
                        </DrawingGroup.Children>
                    </DrawingGroup>
                </DrawingBrush.Drawing>
            </DrawingBrush>
        </Grid.Resources>
        <Rectangle Fill="{StaticResource Compass_ver1}">
            <Rectangle.RenderTransform>
                <RotateTransform Angle="{Binding FlightData.Value.Heading}" />
            </Rectangle.RenderTransform>
        </Rectangle>
    </Grid>
</UserControl>

主窗口XAML：

<local:CompassUserControl DataContext="{Binding Rov}" Height="100" Width="100" RenderTransformOrigin="0.5,0.5"/>

---

属性

RenderTransform

获取或设置由

RenderTransform

属性声明的任何转换的中心点，该中心点相对于已应用转换的元素的边界：

因此-正如@Maxim所建议的那样-您应该在

UserControl

中设置

Rectangle

元素的

renderTransferMorigin

属性：

<Rectangle Fill="{StaticResource Compass_ver1}" RenderTransformOrigin="0.5, 0.5">
    <Rectangle.RenderTransform>
        <RotateTransform Angle="{Binding FlightData.Value.Heading}" />
    </Rectangle.RenderTransform>
</Rectangle>

您的

旋转变换

设置在控件内的

矩形

上，那么为什么您要在

CompassUserControl

上而不是在该矩形上设置

RenderTransferMorigin

？将

renderTransformorMorigin

移动到

Rectangle

，或将

RotateTransform

移动到

CompassUserControl

。感谢您的反馈。又一个“啊哈！”时刻…-）感谢您的反馈和信息。它就像一个符咒。